Solution to "Bootcamp 6 trackpad driver"

Original thread: Bootcamp 6 trackpad driver

Context: In Bootcamp 6, after installing and then uninstalling Trackpad++, I was unable to turn off test signing mode without disabling the trackpad driver. It's been said that Apple didn't digitally sign the driver, but that's not true from my experience; instead, it was Trackpad++ that was screwing things up. Here's how I fixed the issue, making the trackpad usable again without test signing mode.

Solution:

1. You'll probably need a mouse for this, just in case.
2. Download the appropriate Bootcamp drivers using Bootcamp Assistant on your Mac. You can also try direct download, though I don't know where to get them. Put the drivers in your Bootcamp partition, you'll need it later.
3. On Windows, disable test signing mode with bcdedit -set TESTSIGNING OFF
4. Launch Device Manager.
5. In "Mice and other pointing devices", uninstall the Trackpad++ driver.
6. In "Human Interface Devices", right click "Apple SPI Trackpad" and select "Update driver".
7. Click "Browse my computer for driver software".
8. Click "Let me pick from a list of avaliable drivers...".
9. You should see a "Apple SPI Trackpad" driver, which is one of the drivers you downloaded in Step 2 (I think). If you select it, you should see "This driver is digitally signed." at the bottom.
10. Click "Next" to install it.
11. Restart.

Disclaimer: I have never tried these steps directly so I have no idea if they work or not. If they don't, I also tried running Setup.exe inside the Bootcamp drivers and repairing them, and I also restarted lots of times.

Hope this helps!